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Metals 2017, 7(9), 346; doi:10.3390/met7090346

In Situ Study of Phase Transformations during Non-Isothermal Tempering of Bainitic and Martensitic Microstructures

1
Département de Génie Mécanique, École de Technologie Supériere, Montréal, QC H3C 1K3, Canada
2
Finkl Steel Inc., 100 McCarthy, Saint-Joseph-de-Sorel, QC J3R 3M8, Canada
*
Authors to whom correspondence should be addressed.
Received: 30 July 2017 / Revised: 31 August 2017 / Accepted: 1 September 2017 / Published: 4 September 2017
(This article belongs to the Special Issue Bainite and Martensite: Developments and Challenges)
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Abstract

Phase transformations during non-isothermal tempering of bainitic or martensitic microstructures obtained after quenching of a medium-carbon low-alloy steel was studied. The microstructures correspond to different locations of an as-quenched large-sized forged ingot used as a die material in the automotive industry. High-resolution dilatometry experiments were conducted to simulate the heat treatment process, as well as to investigate different phenomena occurring during non-isothermal tempering. The microstructures were characterized using optical and scanning electron microscopy. Dilatometry analyses demonstrated that tempering behavior varied significantly from bainitic to martensitic microstructures. Retained austenite, which exists between bainitic ferrite sheaves, decomposes to lower bainite causing a remarkable volume increase. It was found that this decomposition finishes below 386 °C. By contrast, martensite tempering was accompanied with a volume decrease due to the decomposition of medium-carbon martensite to low carbon martensite and carbides. View Full-Text
Keywords: high strength steel; tempering; dilatation behavior; phase transformation; microstructure; bainite; martensite high strength steel; tempering; dilatation behavior; phase transformation; microstructure; bainite; martensite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Talebi, S.H.; Ghasemi-Nanesa, H.; Jahazi, M.; Melkonyan, H. In Situ Study of Phase Transformations during Non-Isothermal Tempering of Bainitic and Martensitic Microstructures. Metals 2017, 7, 346.

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